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No. 6|4,042. Patented Nov. 8, I898. D. VICKERS, A. T. DAWSON 81.6. T.BUCKHAM.

GEARING FOR TRUNNIONS 0F HEAVY GUNS.

(Application filed Apr. 14, 1898.)

'pw n, I) Lava- UNITED STATES PATENT OFFICE.

DOUGLAS VIOKERS, ARTHUR TREVOR DAWSON, AND GEORGE THOMAS BUCKHAM, OFSHEFFIELD, ENGLAND, ASSIGNORS TO VIOKERS SONS & 00., LIMITED, OF sAMEPLAoE.

BEARING FOR TRUNNIONS OF HEAVY GUNS.

SPECIFICATION forming part of Letters Patent No. 614,042, dated November8, 1898.

Application filed April'll, 1898. Serial No. 677,623. (No model.)

To all whom it may concern:

Be it known that we, DOUGLAS VIOKERS, a managing director of VickersSons 8: Maxim, limited, ARTHUR TREVOR DAWSON, late lieutenant RoyalNavy, superintendent of Ordnance Department, and GEORGE THOMAS BUCKHAM,engineer, citizens of England, all residing at River Don Works,Sheffield, in the county of York, England, have invented certain new anduseful Improvements in Bearings for the Trunnions of Heavy Guns, ofwhich the following is a specification.

This invention relates to a construction of the bearings for thetrunnions of a heavy gun in such a manner that the gun can be withdrawnfrom its mounting without having to be lifted.

Figure 1 of the accompanying drawings is an outside elevation, Fig. 2 isan inside elevation, and Fig. 3 is an end elevation, of part of themounting, in which is formed the bearing for the trunnion. Fig. l is avertical sec tion on the line 4 4 on Figs. 1 and 2. Fig. 5 is anelevation of the inside face, and Fig. 6 is a side elevation of the capwhich forms the bearing for the trunnion. Fig. 7 is a sectional plan onthe lines 7 7 of Fig. 5.

The mounting R has through it a round hole, in the interior periphery ofwhich are formed two helical slots R and R from one of which there is anopening 1 to the inner side of the mounting. There is also a slot R fromthe hole to the rear edge of the mounting. Into the hole of the mountingis fitted a cap Q, which has two studs Q Q projecting from itscircumference, and a polygonal head Q to which a suitable wrench can beapplied so as to turn the cap around. The cap has a circular recess (1,which fits the trunnion T, and from this recess there extends to theperiphery a slot q of less depth than the recess q.

The operations of placing the gun in position on the mounting andremoving it there from are performed as follows: The gun being away, thecap Q is inserted into the hole trunnion T enters the slot R and passesalong 1 it and the slot q. The cap being then turned around until itsslot g reaches the position shown in Fig. 1, the movement of the studs QQ along the helical slots R R having at the same time caused the cap tomove inward, the trunnion T is now secured in the recess q. For removingthe gun the cap is turned until its slot q coincides with R and then thetrunnion T is free to move backward.

Having thus described the nature ofthis invention and the best means weknow for carrying the same into practical effect, we claim- A bearingfor the trunnion of a heavy gun consisting of a cap Q, recessed toreceive the trunnion T, and having a slot g which by partly turning thecap is brought into coin cidence with a slot R in the mounting, thusallowing passage of the trunnion, the cap being also provided with studsQ, Q, engaged in helical slots R, R in the mounting B, so that when thecap is turned back the trunnion T is engaged in its circular recess g.

In testimony whereof we have hereunto set our hands in presence of twosubscribing wit= nesses.

DOUGLAS VICKERS. ARTHUR TREVOR DAWSON. GEORGE THOMAS BUCKHAM.

Witnesses to the signature of the said Doug las Vickers:

HENRY GL VER OOOLEY, HAROLD P. BURDEKIN. Witnesses to the signatures ofArthur Trevor Dawson and George Thomas Buckham:

EDMUND S. SNEWIN, WM. 0. BROWN.

